Hi guys, i'm new here and i hope you can somehow help me. But let's start from the beginning.
As object says, i have this sata HDD (specs at the end of this post) installed into my old pc (tell me if you need its specs) and worked fine untill yesterday, when i decided to install it into my brand new pc (as before, tell me if you need specs) together my other 2 sata SSDs. The whole old pc and all the devices were working fine (no weird noises or whatever).
Connecting to new pc:
sata cables (you didnt say?!

) => ok
Power cables => ...
About power cable, i had used one i had here around (not one "original" that comes with the PSU) just to be faster&easier; it's a standard 6 pin connector (to PSU) and a 4x sata connectors in series (to devices). So i used that cable to power my HDD/SSDs.
Booting up and BIOS shows me only the SSDs but not the HDD. And here the problems are coming up.
1st troubleshooting:
1. tried to check bios settings => none, everything seems to be ok
2. tried to change power cable => nothing changed even using the PSU "original" cable
3. isolating the HDD connecting him with a dedicated power cable (PSU original) => nothing.
4. re-installing this HDD into the old pc => nothing. DEAD.
Result => The drive never spun up after swap.Now, i have to say my ups is going to die and, obviously, a power loss occurred when my old pc with all the HDDs was running. The new pc was turned off. I didnt boot it again cause i had other things to do, so i left it powered off. When i came back, i decided to swap the HDDs so i never booted up the old pc after power loss. In short: i'm not sure when the HDD's PCB die: due the power loss or after swapped it (somehow the new pc blow it up, weird but could it be true?

).
2nd troubleshooting:
I have no experience in this sector, but i loosen the PCB screws of the HDD to see what's wrong with it (i watched various YT videos about how to identify and solve these issues), looking for visually damaged components. Nothing to report.
So i measured using a multimeter a couple of diodes (one beeps - circle n.2 -, the other not - circle n.1) and 6 resistors (some beeps - squares n. 1, 2, 3 -, others not - square n. 4). Please note that i'm NOT sure if squares n. 3 and 4 are resistors, so forgive me if i'm saying wrong. Also please see attached pic for details.
I don't have any suitable equipment to attempt to fix it, nor the skills. So i googled for a PCB but there are so many factors to consider and this confused me even more.
Not sure if i can add more now, so i'm now waiting for some tips.
Thanks in advance.
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